02/07/2019, M4.0 near Ludlow

Last updated April 9th, 2019

  • 07 Feb 2019 08:41:24 PST, (34.703, -116.287), depth 1.6km, 12km W of Ludlow, California
  • Aftershocks: so far (07 Feb 2019, 02:33PM PST) there have been 29 aftershocks recorded, the largest M2.7 (smallest M1.0). More may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
  • There were 17 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M3.5 (2019/02/07).
  • Historical seismicity: since our records began in 1932 we’ve had 62 events of M4 or greater within 10km of today’s event, the largest was M7.1 (1999/10/16) and the most recent was M4.1 on 23 Feb 2016.
  • SCEC Community Fault Model fault associations: most likely Hector Mine rupture dipping (91.6%). Alternates: Not associated with a CFM modeled fault (7.9%), Other CFM faults (0.5%).*
  • Nearby faults: Unnamed fault east of Pisgah (5.1 km), Lavic Lake fault zone (Lavic Lake fault) (5.8 km), Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (9.8 km), Lavic Lake fault zone (10.5 km), Ludlow fault (11.1 km) and Pisgah-Bullion fault zone, Bullion section (Bullion fault) (12.9 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
  • Visit our special reports page for further information on local notable earthquakes.
  • *The location and focal mechanism of this earthquake suggest the above association with modeled faults in the Community Fault Model (CFM) provided by the Southern California Earthquake Center (SCEC). Note that the CFM fault association may be different from the Nearby faults list. This difference is due to how the CFM fault association uses the hypocenter with relation to subsurface 3-dimensional fault orientation models, and the Nearby faults list utilizes mapped surface traces as they relate to the epicenter.

    U.S. Geological Survey and California Geological Survey, 2006, Quaternary fault and fold database for the United States, accessed 2019, from USGS web site: https://earthquake.usgs.gov/hazards/qfaults/

    This information is subject to change as more up-to-date data become available.

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